Difference Between 7 1/4 & 8 1/4

[DoubleADuster]

How do I tell if my car has a 7 1/4 or 8 1/4 rear end?

 

[goldduster318]

7 1/4 has a 9 bolt cover and 2 1/2" diameter axle tubes
8 1/4 has a 10 bolt cover and 3" diameter axle tubes

 

[abodyjoe]

 

[DoubleADuster]

Awesome, thanks.